You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Taylor here.

ASSISTANT: How can I assist you today?

USER: I need your help in booking of a flight ticket between DEN and OAK for an important meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, I can aid you with that.

USER: Thank you.

ASSISTANT: May I know your travel dates for booking flight ticket?

USER: Sure, I am planning to move on 01/27 and please book my return ticket on 01/29.

ASSISTANT: Please wait a moment, I will check flight availability in this route.

USER: Ok, take your time.

ASSISTANT: Sorry no flights available in this route as per your requested dates.

USER: Oh! So sad to hear that. Anyway, I will choose another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for visiting us, have a nice day.

USER: Welcome.