You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Rebecca Phillips from Denver.

ASSISTANT: How can I aid you today?

USER: I have to attend a summit meeting in Boston next week. Can you please help me in booking flight ticket?

ASSISTANT: On which dates do you want to travel?

USER: Thank you for your positive response, I want to take off on 08/25 and please confirm my return ticket also on 08/27.

ASSISTANT: Ok, may I know your airport codes please?

USER: I would like to fly from DEN airport and destination airport is BOS because these two airports are very convenient for me to travel.

ASSISTANT: Ok, hold on for a moment.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Sorry Rebecca, no flight is available for you as per your details.

USER: Oh! So sad to hear that. It's ok I will contact another airline agency. Thank you for your information.

ASSISTANT: You are welcome, have a great day.