You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am George King.

ASSISTANT: How can I help you?

USER: I am planning to attend a marriage of my friend in IAD, can you help me with booking ticket from CLT?

ASSISTANT: Can you please tell your travelling dates?

USER: I will be start here on 04/20 and return 04/22.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available with your request.

USER: It's ok, not an issue for me. Thank you for checking.

ASSISTANT: Thank you and have a nice day.