You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Edward Lopez.

ASSISTANT: Edward Lopez, how may I render you?

USER: Could you please help me in changing my existing reservation?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry, no reservation is available by your name.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for reaching us.