You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Thompson.

ASSISTANT: How may I guide you today?

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

ASSISTANT: I will help you with that, can you please share your journey dates?

USER: I want to travel on 04/29 and 05/01.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your help.