You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Raymond Gonzalez. I am going to attend my sister's baby shower program on 06/11, so could you please help me with booking a flight ticket within price 200?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please share me your airport codes.

USER: My source code is LAS and destination is DCA.

ASSISTANT: When would you like to return?

USER: I will be back on 06/13.

ASSISTANT: Please wait  a while.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found as  per your requriments.

USER: No issue, thank you for your information.

ASSISTANT: Thank you for reaching us.