You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Clark.

ASSISTANT: Clark, how may I help you?

USER: I need to cancel my reservation, can you render me please?

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

USER: Sure, take your own time.

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

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for contacting us.