You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to modify my location airport codes in my existing reservation, can you help me out?

ASSISTANT: Sure, can you mention the name on which ticket was book?

USER: Myself Daniel Harris.

ASSISTANT: Ok, please wait while I check for your reservation in our portal?

USER: Sure, take your own time. I will be waiting for your update.

ASSISTANT: I regret to inform that no reservation was found on your name in our portal.

USER: That's ok, not an issue. Thank you for reaching us.

ASSISTANT: Thank you for contacting us.