You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: I'm Cynthia Garcia here.

ASSISTANT: How can I assist you?

USER: I want to travel from TX-IAH to DC-IAD, to meet my friends at Washington.

ASSISTANT:  Sure, can you please give me your planning dates?

USER: My preferable dates of trip is from 08/07 to 08/09.

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Sorry to say that there is no flight found.

USER: No problem.

ASSISTANT: Thank you for providing me with your details.

USER: Thank you for your help in providing information.