You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Kathleen Harris.

ASSISTANT: How can I benefited to you?

USER: Please help me out in changing my existing reservation, as I have to take my mother to hospital on my existing journey dates.

ASSISTANT: Sad to hear. I will surely help you. Give me a moment, Kathleen.

USER: Ok.

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

USER: That's ok, no issues.

ASSISTANT: Can I help you with anything else?

USER: No, thank you for the information provided.

ASSISTANT: Thank you for choosing us.