You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Miller.

ASSISTANT: How may I aid you at this moment?

USER: Please help me with changing my reservation. Due to some changes in my plan  with my colleagues. Can you help me in my changing reservation?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure, take your time.

ASSISTANT: There is no existing reservation found on your name.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you for your reaching us.