You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Campbell.

ASSISTANT: How may I guide you today?

USER: I want to travel from BOS to AUS. Can you book a flight ticket for me?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I want to travel on 07/20 and 07/22.

ASSISTANT: Give me a minute.

USER: Ok, take your time.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.