You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Rachel Lopez here. My grand mother expired, so I need to attend funeral. Can you book a ticket from MCO to DFW?

ASSISTANT: I am sorry to her that, may I know the dates please?

USER: My travelling dates are from 07/21 to 07/23.

ASSISTANT: There is no flight, Rachel.

USER: That's ok. Thank you for your help.

ASSISTANT: Thanks for reaching us.