You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Eric Williams, want to travel from IAD to PHX. Please help me.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 10/03 to 10/05.

ASSISTANT: Sorry, no flights found on your preferable dates.

USER: Thank you for your help.

ASSISTANT: Ok, thank you for reaching us.