You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation, can you please help me out?

ASSISTANT: Sure, please provide me the name to check for the status.

USER: Sure, my name is Pamela Mitchell.

ASSISTANT: Here, I have found your reservation and please provide me the modified airport codes?

USER: My travelling airport codes are LAS to PHX.

ASSISTANT: Please provide me the travel dates.

USER: My travelling dates are Aug 10 and Aug 12.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight to reach my destination.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.