You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Ruth Martinez.

ASSISTANT: Ruth Martinez, welcome to our agency.

USER: I want to book a ticket from DFW to OAK to meet my client.

ASSISTANT: Ok, can I know your travelling dates for the following journey.

USER: My departure date is 05/09 and return on 05/11.

ASSISTANT: Ok, give me a moment to check please.

USER: Sure.

ASSISTANT: Ruth Martinez, all the tickets on your requested route are sold out. Sorry for the inconvenience.

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

ASSISTANT: Thank you for choosing our agency.