customer: Hello. 
 agent: Hello, How may I help you out? 
 customer: Can you please book a flight ticket with the name of Christopher Smith to Oakland, OAK? 
 agent: Sure. 
 customer: Thank you. 
 agent: On which dates, can I reserve you a seat? 
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 agent: Ok. Please share the origin place. 
 customer: Washington, IAD is my boarding point. 
 agent: Ok, please wait, I will revert to you. 
 customer: Sure. 
 agent: Thanks for your precious time, no flights found in search. 
 customer: It's ok, no problem. Than you for your information. 
 agent: Thank you.
customer: I am planning to attend for my brother's wedding on 05/26.So, I will start on 05/25 and return on 05/27.