You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: I just want to change an existing reservation as my plan to meet my grand parents got postpone due to my  health issues, can you help me with this?

ASSISTANT: Sure, I can help you. May I know your name?

USER: I am Rebecca Scott.

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

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.