You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Wilson.

ASSISTANT: How may I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure.

ASSISTANT: Alexander, no reservation has been found on your name.

USER: That is fine, no issues. Thank you for your time.

ASSISTANT: Thank you for reaching us.