You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: This is Lisa Gonzalez.

ASSISTANT: Nice to meet you.

USER: I want to change my recent reservation as my plans got postponed, can you help me with that?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Ok.

ASSISTANT: Lisa Gonzalez, there is no active reservation found under your name to do modifications in that.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.