You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Timothy Brown.

ASSISTANT: What can I do to make your experience better with us?

USER: I made a reservation earlier from  Phoenix in connecting flight but now I want to travel in  direct flight. can you help me in changing my reservation?

ASSISTANT: Sure, I'll try to help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please let wait a moment I will check the reservation list.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to inform you that there is no active reservation found with your name in our database to change it.

USER: No issue, I will choose an other alternative. Thank you for the information.

ASSISTANT: Thank you for opting us.