You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Elizabeth Clark, want to travel from IAD to SEA on 05/15.

ASSISTANT: Can I know your return date?

USER: My return date will be on 05/17.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no flights available on your given dates. I am sorry for that.

USER: It's ok, thank you for your service.

ASSISTANT: Thank you for reaching us.

USER: My pleasure.