You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Alexander Harris, can you help me to change my reservation?

ASSISTANT: I am here to help you, please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is no reservation found on your name to change it.

USER: No issues, thank you for your time.

ASSISTANT: Thanks for reaching us.