customer: Hello, I am Angela Thomas. 
 agent: Hello. How may I help you out? 
 customer: Can you please help me in booking a flight ticket from IAD to reach PHX? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 __ 
 agent: Sorry, there are no flights found. 
 customer: That's not a problem. Thanks for your information. 
 agent: Thank you for reaching us.
customer: My travelling dates are from Apr 17 to Apr 19.