You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Frank Lewis here.

ASSISTANT: How can I guide you?

USER: Can you help me in changing my reservation?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No issues, thank you for the help.

ASSISTANT: Thank you for reaching us.