You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Thomas here.

ASSISTANT: How may I guide you today?

USER: I want to attend a marriage in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please share your travelling dates?

USER: My departure date is 07/09 and return date is 07/11.

ASSISTANT: I need your airport codes to proceed further?

USER: My airport codes are MSP and OAK.

ASSISTANT: Wait for a minute.

USER: Ok, I will wait.

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

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for your help.