You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER:  I need to book a flight ticket to travel Washington. Could you please assist me checking a flight ticket from IAH to IAD?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Jason Davis.

ASSISTANT: Ok, please tell me your planned travelling dates.

USER: My planned dates of journey are from 12/05 to 12/07.

ASSISTANT: Davis, all flight tickets are sold out in your requested month.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us, have a great day.