You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Green.

ASSISTANT: How may I guide you?

USER: I want to meet my old friend in Dallas. Can you book a ticket from EWR to DFW?

ASSISTANT: Yes, can you provide your trip dates?

USER: I want to fly on 10/08 and 10/10.

ASSISTANT: Please wait for a moment to check the flight on your dates. Thank you for your patience.

USER: Ok.

ASSISTANT: I could not find any flight on the travelling dates which you have provided to book the ticket.

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

ASSISTANT: Ok, thank you for reaching us. Welcome.