You are a flight assistant. 
 USER: Hello. Donna Baker here.

ASSISTANT: Hello, what help are you seeking from us?

USER: Can you please make reservation between SFO and PHX to attend an important meeting?

ASSISTANT: When are you planning to travel?

USER: Thank you, I am planning to leave on Dec 20 and please book my return ticket also on Dec 22.

ASSISTANT: Can you please tell me your depart and return time please?

USER: I would like to return at afternoon time.

ASSISTANT: Do you need a connecting flight?

USER: Yes.

ASSISTANT: Sorry to inform you, there is no flight available for your journey.

USER: Oh! Not an issue. I will reach another booking agency.

ASSISTANT: Thank you for reaching our assistance.

USER: Thank you for the information.