You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Alexander Jones, want to travel from DTW to EWR. Please help me in booking my ticket.

ASSISTANT: On which dates you are willing to travel?

USER: Sure, my travelling dates are from 01/19 to 01/21.

ASSISTANT: There is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.