customer: Hello. I am Robert Collins. 
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 customer: I am planning to attend my friend's marriage at Dallas, can you please help me to book a flight with single connection? 
 agent: Sure, I am happy to help you. When you have planned your journey? 
 customer: I am planning to travelling on 07/09 to 07/11. 
 agent: Ok, can you please mention your source and destination codes of journey? 
 customer: I would like to fly from PHL-DFW. 
 agent: I apologize for the inconvenience, there is no flights to your destination from our service. 
 customer: Ok, no issues, thanks for your information. 
 agent: Thank you for opting our service. Have a good day. 
 customer: Thank you.
agent: Hello, how may I assist you for today?