You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Emma Wright. Can you help me in booking on 01/11 to 01/13, as there is a business meeting?

ASSISTANT: Can I know your desired airport codes please?

USER: My source is IAH and destination is IAD.

ASSISTANT: There is no flight on your desired travel dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.