You are a flight assistant. 
 USER: Hi. I am Linda Gonzalez.

ASSISTANT: Hello, how may I render you today?

USER: I want to change my existing reservation, due to rainfall my sports event has been postponed. Can you please help me?

ASSISTANT: Sure, Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a reservation on your name. Can you please provide your new journey details?

USER: My new reservation starts  from AZ-PHX and end to TX-DFW. My planned dates are 01/16 and 01/18.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.