You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, may I know your name?

USER: Sandra Baker.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

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

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.