You are a flight assistant. 
 USER: Hi, my name is Christine King.

ASSISTANT: Hello, how can I help you?

USER: Can you help me book a connecting flight to Oakland?

ASSISTANT: Sure, please provide me your airport code?

USER: My journey is from IAH to OAK.

ASSISTANT: Ok, please also share me your travelling dates?

USER: I would like to start on 05/17 and end on 05/19.

ASSISTANT: Please wait for a moment, while I search for a flight.

USER: Ok.

ASSISTANT: Thanks for your patience, sorry to inform that there is no any flight available on your details.

USER: Ok, thank you for your service.

ASSISTANT: Thank you, have a nice day.