You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Pamela Thomas here.

ASSISTANT: How may I assist you?

USER: Can you please reserve a flight ticket from AUS to IAD for my business meet?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Thank you, my departure is on 10/26 and please book my return ticket also on 10/28.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT:  Pamela Thomas, there are no flights available in your route.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Welcome.