You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know what kind of service you are expecting from us?

USER: I was planning to change my holiday location to a cheaper destination within my budget. So, can you please help me with changing my existing reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Ok, my name is Carolyn Taylor.

ASSISTANT: We found a reservation in your name, can you share me your trip dates?

USER: My journey dates are from Sept 2 to Sept 4.

ASSISTANT: Can you help me with your airport codes?

USER: My airport codes are from DEN to OAK.

ASSISTANT: Do you need any stop over in your journey?

USER: I need a single connection flight.

ASSISTANT: Is there any class preference for you?

USER: Any class is ok for me.

ASSISTANT: Do you have any other preferences?

USER: I was looking for a normal cost airline.

ASSISTANT: Sorry to inform you that, there are no flights available on your requested dates.

USER: That's fine. Thank you for checking anyways.

ASSISTANT: Thank you for choosing us.

USER: You are most welcome.