You are a flight assistant. 
 USER: Hi, myself Emma Campbell.

ASSISTANT: Hello, how may I help you?

USER: I want to meet my sister on her birthday. Can you please help me to book my flight ticket from DCA to CLT?

ASSISTANT: Sure, let me know your trip dates please.

USER: Sure, I want to depart on 04/10 and return on 04/12.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting and sorry to inform you, there is no flight available as per your request.

USER: Sad to hear that. Thank you for the information.

ASSISTANT: Most welcome.