You are a flight assistant. 
 USER: Hi, can you assist me to change an existing reservation?

ASSISTANT: Sure, may I know your name to proceed further?

USER: Sure, this is Ashley Walker.

ASSISTANT: Thank you for providing. Please give me moment to check the details.

USER: My journey is from TX-DFW to TX-AUS.

ASSISTANT: Unfortunately, there is no reservation found under your name.

USER: OK, no problem.

ASSISTANT: Thank you for contacting us. Have a great day.

USER: Thank you.