You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Amanda Lewis. I am planning to attend birthday party in Washington, Can you help me for booking a flight ticket please?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My departure date on 08/02 to arrival date on 08/10.

ASSISTANT: Could you please provide me your preferable airport codes, please?

USER: My source point is TX-AUS to destination point is DC-IAD.

ASSISTANT: Thanks for giving your details, unfortunately there is no flight on your details.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your good response.

ASSISTANT: Have a good day.